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SUBORDINATED DEBENTURES (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2017 | Dec. 31, 2021 | Feb. 01, 2021
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed-to-floating rate subordinated debentures | $ 80.0 |  |  |  |  |
Subordinated notes payable, net |  | $ 197.1 |  |  | $ 197.1 |
Interest expense related to the subordinated debt |  | $ 2.2 | $ 1.9 |  |  |
Subordinated Debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed-to-floating rate subordinated debentures |  |  |  | $ 115.0 |  | $ 115.0
Fixed annual interest rate |  |  |  | 4.50% |  | 4.50%
Basis points |  |  |  | 2.66% |  |
Callable Notes After Five Years | Subordinated Debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed-to-floating rate subordinated debentures | $ 40.0 |  |  |  |  |
Debt Instrument, Term | 5 years |  |  |  |  |
Fixed annual interest rate | 0.0525% |  |  |  |  |
Debt instrument variable rate description | three-month LIBOR |  |  |  |  |
Basis points | 3.60% |  |  |  |  |
Callable Notes After Ten Years | Subordinated Debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed-to-floating rate subordinated debentures | $ 40.0 |  |  |  |  |
Debt Instrument, Term | 10 years |  |  |  |  |
Fixed annual interest rate | 0.0575% |  |  |  |  |
Debt instrument variable rate description | three-month LIBOR |  |  |  |  |
Basis points | 3.45% |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
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